Hoeace e



-the side 0f plug' F, being of such size as will SPEIFICATION formingpart of Letters Patent N0. 285,779, dated October 2, 1883. Applicatinnfiled Marc]: 16, 188" (N0 model.)

T0 all whom -z't may concern:

Be it known that I, HORACER. ALLEN, a eitizen 0f alle United Stabes,residing ab Indianapolis, in tl1e eonnty of Marion and State of Indiana,ha-ve invented new and useful Improvements in Ohills for Caso-lron, ofiwhieh be following is a speeifieation.

My invention relates t0 ehills for east-iron, the obj eet of whieh is toprovide means to easb a smootl1 hole with parallel sides in varions artsof maehineryas the l1ubs of pulleys, gear-wheels,- and other parts wherea smooth parallel hole having ehilled 01 hardenecl sicles is reqnirecl.I attain this objeet by 1neans of the meehanism in'the aeeompanyingdrawings, in Whieh Figurel is a perspeetive view 0f sleeve having ataperhole tlnough the micldle and a slot eub through one side. Fig. 2 is aperspeetive view 0f taper plug wit-h spline Set in 011e sicle. Fig. 3 isa perspeetive view 0f theehill Wit l1 all {alle arts in position f01use.

Si1nilar letters refer t-0 si mil a1 parts tlnough 01113 the sevearalviews.

The sleeve A, F1'g. l, has a taperhole, O, through the middle, ai1d aslot, B, auf; tl1rough one side so reeelve tl1e spline E. Theplng F,Fig. 2, is 0f same taper froni O t0 H as the hole 0 in sleeve, Fig: l. Eis a spline set on slide into the groove B, Fig. 1, filling it entirely.The end I;l G is slightly taperecl toward end G, 130 fit easily intoeoreprinfl 0n pattern. a greater deg'ree, in orde1 that the eope 01 toppart of the mold will holclin an upnight position more easily.

Fig. 3 shows tl1e sleeve A and plug F in position when, after reeeivinga liberal eoating of plumbago 01 oil, ready t0 be plaeed in the mold.After the 1netal has been poured into ehe nxold and tl1e easting hasbecome 001d, the ehill ean be easily removed by tap ping 011 small end Dof plug F. On the re HORAOE R. ALLEN.

\Vitnessesz SILAS M. SHEPARD, V. B. STIARWAL'I.

The e11d D C is also tapered, bnt t0

